This comparison test actually began on January 2, 2002. That's the day Bob Lutz, GM's superstar product czar, drove the Solstice concept car onto a stage at the North American International Auto Show in Detroit and pronounced to the world that GM would produce the roadster and it would have a base price under $20 grand.

Well, Bob delivered as promised. Here we are less than three years later testing the production Solstice, which is a mirror image of that concept car. "The 2006 Pontiac Solstice," says GM's literature, "delivers both the thrill of open-air driving with balanced performance and refinement at an attainable price."

After pounding this Cool Silver Solstice around for a while, we agree with that statement wholeheartedly. It's a fun, affordable little ride, and we expect them to sell every one they can bolt together. But the Solstice still isn't the inspired sports car we were hoping for and in this test it finishes second to the new Miata.

From the Parts Bin

As it turned out, the rush to production, along with the promised low price, forced GM to build the Solstice essentially from its extensive parts bin. And the resulting driving experience isn't quite as inspired as we would have hoped.

The list of borrowed hardware is extensive, and includes gauges from the Pontiac Vibe, brakes and rear suspension from the Cadillac CTS and seats from the European-market Opel Corsa.

Even the drivetrain is plucked from other rides. The Pontiac's Ecotec engine —an all-aluminum double-overhead-cam, normally aspirated 2.4-liter four-cylinder — also calls the engine bay of the Chevrolet Cobalt SS home, and its five-speed manual gearbox is also used in the Chevrolet Colorado pickup truck.

Pontiac also decided to use a smaller version of the Chevrolet Corvette's chassis design. It even shares the unique manufacturing process of hydroforming the frame rails with the Corvette.

These aren't bad parts. In fact they work surprisingly well together. But cohesive design from a clean sheet of paper would have surely cured some of the Solstice's shortcomings.

For instance, without dials to monitor water temperature or oil pressure, the Vibe's gauges are incomplete for a two-seat sports car. We also think the Opel's seats are a little pillowy for such a vehicle, and the downsized Corvette chassis created too many packaging issues including a nearly useless trunk and a massive transmission tunnel, which dominates the Pontiac's interior.

We also found the drivetrain to be less than ideal. With 177 peak horsepower at 6,600 rpm and a torque peak of 166 pound-feet at 4,800 rpm, the Ecotec has enough guts for the application, but it revs slowly, gets a little riotous at higher rpm and crudely hangs on to revs when you back off the gas. Not exactly what you expect from the engine in a two-seat sports car, and the tall gearing in the truck-sourced five-speed only accentuates the engine's economy car roots.

The Good Stuff

OK, enough griping. The Solstice has plenty going for it. Plenty.

First of all, it's sexy as hell. Park it next to the Miata and only the president of the local Miata Club will notice the Mazda.

Second, it performs well, running zero to 60 mph in 7.7 seconds and the quarter-mile in 15.8 seconds at 87 mph. The Miata, which is smaller, lighter and geared shorter, is only slightly quicker. It hits 60 mph in 7.5 seconds and sprints the quarter in 15.5 seconds at 89 mph.

It also turned the same slalom speed as the Miata, an impressive 64 mph, and matched the Mazda's lap time around the racetrack.

Short/long control arms and Bilstein coil-over shocks make up the Pontiac's front suspension, and all the hardware is exclusive to the Solstice. It works well with the Cadillac-sourced rear suspension, providing a firm but compliant ride, and extremely stable handling. Still, we would like the Solstice to offer more feedback and respond better to different driving techniques.

Push it hard and the Solstice has one cornering attitude, it understeers. Regardless of what the driver does, the Pontiac's huge 18-inch rear tires refuse to give up their grip of the road. This makes for quick slalom times, and it's the way you want your mom's car set up, but it quickly bores the advanced driver.

The Miata, on the other hand, offers an infinite number of cornering attitudes to choose from. And it allows the advanced driver to adjust and choose between those attitudes at any time through his skillful use of the steering, brakes and throttle. In other words, although the big-tired Pontiac can match the Miata's slalom and lap times, the Mazda handles more like a real sports car.

Most of GM's current passenger cars use electrically assisted steering we're not especially fond of. Thankfully, the Solstice doesn't. Its hydraulic system is still a bit slow (the ratio is 16.4 to 1) and still a bit numb compared to the Miata's steering, but trust us, it's much better than it would have been if GM went with the electric system.

We must also praise the Pontiac's four-wheel disc brakes. They're without the spongy, overly long pedal travel that has plagued GM's brake systems for years, and they're properly heat resistant. The Solstice stops from 60 mph in just 122 feet, just 5 feet more than the Miata's performance.

Cockpitlike Cockpit

Compared to the cramped Miata, which is nearly 4 inches narrower and rides on a 3.4-inch-shorter wheelbase, the Pontiac's interior feels roomy top up or down.

You sit relatively low in the Solstice, but not low enough. Most drivers felt their relationship to the leather-wrapped steering wheel could be better if the seat would go down a bit or the tilt wheel offered one more notch up. The wraparound dash and high door sills, however, do make you feel like you're down inside the car and its bolstered seats are supportive.

Most everything is placed well, including the shifter, which has short-enough throws, and the effective climate control system, which is made up of three big knobs. The optional seven-speaker Monsoon stereo is also outstanding, even with the top down at highway speeds.

There's still too much hard gray plastic, however, seemingly acres of it, and there are a few ergonomic issues Pontiac should have addressed. The three more annoying ones are the laughable placement of the cupholders behind the driver's right elbow, the constant reflection of the interior trim in the rearview mirror, and the origami-style roof-folding exercise that forces you out of the car.

Putting the top up is even worse, requiring you to walk to both sides of the car to secure the individual flying buttresses, which don't really sit flush to the deck lid like they should.

Conclusion

Hop in the Solstice after driving the Mazda Miata and the Pontiac's extra bulk, vague controls and unresponsive handling simply detract too much from the purity of the drive.

It's a smile maker for sure, but the Miata gets you grinning from ear to ear.

Over the last 15 years, Mazda's Miata has accumulated a goodly number of kill stickers on it flanks. Affordable drop tops that have taken on the Mazda only to have gone down in flames include the front-wheel-drive Australian-built Mercury Capri of the 1980s and the front-drive Lotus Elan of the mid-'90s.

Well, the 2006 Pontiac Solstice put up a good fight, but you can add it to the list of the Miata's fallen foes.

A little larger, a little more refined and a lot more powerful than its predecessor, the 2006 Mazda MX-5 Miata is without a doubt the best of its breed. Mazda has taken everything that was always right with previous generations of the roadster and improved upon all of it.

Still Tossable

Still under 2,500 pounds, the Miata is as tossable as ever. Mazda's engineers were able to improve the car's ride by increasing its wheelbase by 2.6 inches and increasing its rear suspension travel, but without sacrificing its athleticism.

They also completely rethought the car's balance. Despite the new version's additional size, by using aluminum instead of iron for the engine's block and mounting it 5.3 inches farther back in the chassis, they kept the car's overall weight increase to only 22 pounds, while shifting some of the mass rearward. Mazda says the car is now slightly nose-heavy at the curb, but comes back to 50/50 with two aboard.

These changes have made the Miata easier to drive fast. No longer does the rear end want to snap around during trail braking, a situation which was only made worse by its super-short wheelbase. More than one Miata has been backed off the road over the years. Now the car rotates just enough for advanced drivers to get a thrill, while the longer wheelbase and larger tires have slowed the transitions so the slide is much easier to catch.

A little less body roll during hard cornering would be nice, but the setup works so well, we're hesitant to even suggest a change.

Combine those moves with quick and communicative steering, a stiff chassis and trustworthy brakes, which stop it from 60 mph in just 117 feet, and the new Miata is sinful on a mountain road, and just flat-out addicting on the racetrack. Although its pace could be matched by the Solstice in the slalom (64 mph), as well as on the road and racetrack, the Miata's is the more engaging and ultimately more rewarding drive.

Basically, the Miata does exactly what its driver asks it to, right or wrong. We like that. But the tradeoff for all that response is a busier highway ride than you get in the Pontiac. This is still by far the most open-road-friendly Miata there has ever been, but it's still too small, too noisy and too choppy on the interstate to make driving across states fun.

Fast Enough, Finally

It's faster, too. Faster than its predecessor and faster than the Solstice.

Power comes from a 170-hp, 2.0-liter, double-overhead-cam four-cylinder that heads for the top of the tachometer like New Yorkers head for the Hamptons on summer weekends. Redline is a heady 6,750 rpm, and the power peaks at 6,600 rpm, but the engine feels so good up there, and the gearing of the six-speed is so short, Mazda lets the engine reach past 7,200 rpm before any sort of rev limiter kicks in. Sometimes holding a gear and saving a gear change makes a whole lotta sense, and those extra revs come in handy.

But you don't have to ring this engine out like a dishrag to find power. It's surprisingly strong off idle and has a nice punch in the middle of its rev range. Its torque peak of 140 lb-ft hits at 4,800 rpm, which may sound high, but with the ultrashort gearing in the Miata's six-speed it's easy to find.

Just how much shorter is the gearing in the Miata's six-speed compared to the five-speed in the Solstice? Listen to this. The Miata finishes the quarter-mile at the top of fourth gear, while the Solstice hits the traps in third. And out on the highway the difference is really jarring. The Miata revs close to 4 grand at 80 mph in sixth gear, while the Solstice is revving under 3,000 rpm in fifth. This makes passing on the highway easy, while passing in the Solstice requires a downshift, maybe two.

It also gave the less powerful and lighter Miata bragging rights at the drag strip, where it sprinted from zero to 60 mph in 7.5 seconds and through the quarter-mile in 15.5 seconds at 89 mph. Both performances are better than the Solstice can manage.

Throw in the fact that the Miata's engine sounds better, is smoother and out-sprints the Solstice through a lighter clutch, and it's clear which car's drivetrain we prefer.

Upscale Interior

The redline on the Miata's tachometer completely disappears at night.

That's the biggest complaint we can lodge at the Mazda's new interior. Sure it's cramped compared to the interior of the larger Pontiac, but it's also better appointed, offers a better driving position and has far superior fit and finish.

Jump from the Solstice and into the Miata, and the first thing you notice is the Mazda's full instrumentation, which even includes a real oil pressure gauge with a needle that moves and everything. Then you notice its artfully finished three-spoke steering wheel, its firm and supportive seat, and that perfectly placed stubby little shifter. We also really like the upscale piano black trim on the dash and the fact that the window switches are on the console behind the shifter where they should be.

There are four cupholders, two behind the shifter and one on each door. Don't plan on doing much shifting if you load up the two behind the shifter. Otherwise, it's a masterpiece of packaging. But we do question the need for redundant radio controls on the steering wheel when the faceplate of the sound system is just 4 inches to the right. We'll reach over.

To drop the top, you don't even have to leave your seat. Just reach up, unlatch a single central latch at the windshield header, and toss the top back. It even folds so cleverly as to form its own boot, much like the top on a Porsche Boxster does. By comparison, the top design on the Solstice is…OK, we'll be nice…"wanting."

Wind noise and turbulence with the top down is also considerably better in the Miata. By reshaping the windshield header, adding small front-quarter windows and providing a wind blocker behind the seats, Mazda masterfully steers the rushing air away from the car's occupants. In the Pontiac that same 70-mph gust curls around the A-pillar unopposed and slams the driver flat in the face.

Conclusion

And it's those details, and there are quite a lot of them, that give the Miata the edge over the Solstice. When you drive the Mazda, it becomes obvious that every aspect of the car was designed and engineered by people who love cars and love to drive. You can tell they told the bean counters, the suits and all the other stuffed shirts how it was going to be and not the other way around.

This is rare in the car business, and the results speak for themselves.

Mazda has managed to make the Miata more comfortable, easier to drive and just plain faster, but without sacrificing any of its purity or affordability. The 2006 MX-5 isn't only the best Miata ever, it's still a Miata and it's still the affordable sports car of choice.

Check the stats and the similar performance numbers of these two cars, and you'd expect this test to be a dead lock, maybe even a squeak-out win for the Pontiac.

Didn't happen, the Miata walked away with this one.

Don't get us wrong, we like the Solstice. In fact, if the Pontiac was competing with a 2005 Miata we're pretty sure it would have come out on top.

But this new Miata, or MX-5, or whatever Mazda is calling it, is really something. Its interior is better finished than the Pontiac's, its performance is a bit better and it's the better convertible, with superior wind protection for its passengers and a far superior top design.

But the biggest reason the Miata took this one is the simple fact that it's 10 billion times more fun to drive. It's more responsive. Its engine is livelier and its gearbox feels like it was plucked from a shifter kart. It also has more steering feel, and it stops better.

The Pontiac, although fast, just doesn't offer the same connection to the machine. It feels distant, more like a boulevard star than a true two-seat sports car.

Well, in our world, these roadsters are supposed to be true sports cars. And sports cars are supposed to be fun. The more fun the better. And cars just don't get any more fun than the 2006 Mazda MX-5 Miata.

This comparison test actually began on January 2, 2002. That's the day Bob Lutz, GM's superstar product czar, drove the Solstice concept car onto a stage at the North American International Auto Show in Detroit and pronounced to the world that GM would produce the roadster and it would have a base price under $20 grand.

Well, Bob delivered as promised. Here we are less than three years later testing the production Solstice, which is a mirror image of that concept car. "The 2006 Pontiac Solstice," says GM's literature, "delivers both the thrill of open-air driving with balanced performance and refinement at an attainable price."

After pounding this Cool Silver Solstice around for a while, we agree with that statement wholeheartedly. It's a fun, affordable little ride, and we expect them to sell every one they can bolt together. But the Solstice still isn't the inspired sports car we were hoping for and in this test it finishes second to the new Miata.

As it turned out, the rush to production, along with the promised low price, forced GM to build the Solstice essentially from its extensive parts bin. And the resulting driving experience isn't quite as inspired as we would have hoped.

The list of borrowed hardware is extensive, and includes gauges from the Pontiac Vibe, brakes and rear suspension from the Cadillac CTS and seats from the European-market Opel Corsa.

Even the drivetrain is plucked from other rides. The Pontiac's Ecotec engine —an all-aluminum double-overhead-cam, normally aspirated 2.4-liter four-cylinder — also calls the engine bay of the Chevrolet Cobalt SS home, and its [b]five-speed manual gearbox is also used in the Chevrolet Colorado pickup truck[/b].